CN105629284A - Ionizing radiation dose acquisition method and device - Google Patents
Ionizing radiation dose acquisition method and device Download PDFInfo
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- CN105629284A CN105629284A CN201511016971.6A CN201511016971A CN105629284A CN 105629284 A CN105629284 A CN 105629284A CN 201511016971 A CN201511016971 A CN 201511016971A CN 105629284 A CN105629284 A CN 105629284A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/02—Dosimeters
- G01T1/026—Semiconductor dose-rate meters
Abstract
The embodiment of the invention provides an ionizing radiation dose acquisition method and device. The method comprises the steps that radiation information of a certain area is measured by utilizing a radiation detector; the radiation information is amplified and current signals corresponding to the radiation information are converted into analog pulse signals; the analog pulse signals are converted into digital pulse signals; time width information of the digital pulse signals is acquired according to the digital pulse signals; and the ionizing radiation dose of the area is acquired through the time width information. The technical scheme has the following beneficial effects that radiation energy, such as X and gamma-ray radiation energy, can be identified through pulse width so that the radiation dose can be calculated and accuracy of the measurement result can be enhanced. Compared with methods which do not consider ray energy, measurement accuracy is enhanced by 10% by the ionizing radiation dose acquisition method. Compared with methods which accurately acquire energy spectrum information, the circuit structure is simple, realization is easy and cost is low.
Description
Technical field
The present invention relates to ionizing rays Detection Techniques field, particularly relate to a kind of ionizing radiation dose acquisition methods and device.
Background technology
In core and radiation detection field, it is possible to carry out radiation dose calculating accurately helping user to optimize personnel, place Radiation Exposure. Comparing conventional dose calculation methodology at present and mainly contain two kinds, the first, provide radiation dose value by the product of counting rate and the dose calibration coefficient of specific radioactive source; 2nd kind comprehensively responds in conjunction with counting rate, ray energy and calibration factor and to provide radiation dose value. But because the size of Net long wave radiation dosage that gamma-rays produces for tissue is relevant to gamma-ray energy. Adopt the result that the first method is measured, owing to not considering that X, energy of �� ray difference make measuring result and true result there is larger difference. 2nd kind of method obviously can provide measuring result more accurately because considering ray energy.
International Commission on Radiological Protection (ICRP) gives the relation curve based on different X, energy of �� ray and dose response in No. 73 reports, for accurately calculating dose rate information. The radiation dose measuring result that some semiconductor detectors and scintillator detector provide at present is the result calculated based on this curve data, provides and is worth comparatively accurately. But the prerequisite that can carry out this kind of calculating is that detector can know X, gamma-ray spectral information. And obtaining the circuit complex structure of spectral information, cost is very high.
Summary of the invention
The embodiment of the present invention provides a kind of ionizing radiation dose acquisition methods and device, to provide a kind of new dosimeter for slit radiographic apparatus calculation method, thus provides measuring result more accurately.
On the one hand, embodiments providing a kind of ionizing radiation dose acquisition methods, described method comprises:
Radiation detector is utilized to measure the radiation information in a certain region;
Undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal;
Described analog pulse signal is converted to digital pulse signal;
According to described digital pulse signal, obtain the time width information of described digital pulse signal;
By described time width information, obtain the ionizing radiation dose in described region.
On the other hand, embodiments providing a kind of ionizing radiation dose acquisition device, described device comprises:
Radiation information measuring unit, for utilizing radiation detector to measure the radiation information in a certain region;
Amplify conversion unit, for being undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal; Described analog pulse signal is converted to digital pulse signal;
Time width information acquiring unit, for according to described digital pulse signal, obtaining the time width information of described digital pulse signal;
Ionizing radiation dose processing unit, for by described time width information, obtaining the ionizing radiation dose in described region.
Technique scheme has following useful effect: can screen quantity of radiant energy by pulse width, such as X, gamma-ray energy, and then calculation of radiation dose, it is to increase the accuracy of measuring result. Relative to not considering that the method accuracy of measurement of ray energy improves 10%. Simple relative to the method circuit structure accurately obtaining spectral information, it is easy to realize, cost is low.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of ionizing radiation dose acquisition methods schema of the embodiment of the present invention;
Fig. 2 is a kind of ionizing radiation dose acquisition device structural representation of the embodiment of the present invention;
Fig. 3 is the embodiment of the present invention another kind of ionizing radiation dose acquisition device structural representation;
Fig. 4 is the present invention's application case-based system pulse temporal width information circuit diagram;
Fig. 5 is that the present invention's application example dosimeter for slit radiographic apparatus calculates schema.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, being a kind of ionizing radiation dose acquisition methods schema of the embodiment of the present invention, described method comprises:
101, radiation detector is utilized to measure the radiation information in a certain region;
102, undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal;
103, described analog pulse signal is converted to digital pulse signal;
104, according to described digital pulse signal, the time width information of described digital pulse signal is obtained;
105, by described time width information, the ionizing radiation dose in described region is obtained.
Preferably, described radiation detector comprises: PIN semiconductor detector; Described radiation information comprises X, gamma-rays radiation information; Described undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information be converted to analog pulse signal, comprising: by amplifying circuit and undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal.
Preferably, described described analog pulse signal is converted to digital pulse signal, comprising: by comparer, described analog pulse signal is converted to digital pulse signal.
Preferably, described according to described digital pulse signal, obtain the time width information of described digital pulse signal, comprise: by the sampling thief of fixed frequency, described digital pulse signal is sampled, by judging that a positive rise and a negative edge judge a whole number pulse signal, obtained the time width information of described digital pulse signal by the number of the sampling point between positive rise and negative edge.
Preferably, described by described time width information, obtain the ionizing radiation dose in described region, comprising: by described time width information, utilize formula D=(Nt1��Kt1+Nt1��Kt2+Nt2��Kt3+ ... )/T, by cumulative different NtnAnd KtnProduct, obtain the ionizing radiation dose D in described region, wherein, D represents ionizing radiation dose, NtnRepresent tnCounting rate in time region, KtnRepresent tnMetering correction factor in time region, T represents Measuring Time.
As shown in Figure 2, being a kind of ionizing radiation dose acquisition device structural representation of the embodiment of the present invention, described device comprises:
Radiation information measuring unit 21, for utilizing radiation detector to measure the radiation information in a certain region;
Amplify conversion unit 22, for being undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal; Described analog pulse signal is converted to digital pulse signal;
Time width information acquiring unit 23, for according to described digital pulse signal, obtaining the time width information of described digital pulse signal;
Ionizing radiation dose processing unit 24, for by described time width information, obtaining the ionizing radiation dose in described region.
Preferably, described radiation detector comprises: PIN semiconductor detector; Described radiation information comprises X, gamma-rays radiation information; As shown in Figure 3, for the embodiment of the present invention another kind of ionizing radiation dose acquisition device structural representation, described device not only comprises: radiation information measuring unit 21, amplification conversion unit 22, time width information acquiring unit 23, ionizing radiation dose processing unit 24, also comprise: amplify circuit 25, for being undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal.
Preferably, described device also comprises: comparer 26, for described analog pulse signal is converted to digital pulse signal.
Preferably, described time width information acquiring unit 23, specifically for described digital pulse signal being sampled by the sampling thief of fixed frequency, by judging that a positive rise and a negative edge judge a whole number pulse signal, obtained the time width information of described digital pulse signal by the number of the sampling point between positive rise and negative edge.
Preferably, described ionizing radiation dose processing unit 24, specifically for by described time width information, utilizing formula D=(Nt1��Kt1+Nt1��Kt2+Nt2��Kt3+ ... )/T, by cumulative different NtnAnd KtnProduct, obtain the ionizing radiation dose D in described region, wherein, D represents ionizing radiation dose, NtnRepresent tnCounting rate in time region, KtnRepresent tnMetering correction factor in time region, T represents Measuring Time.
Below by way of application example, embodiment of the present invention technique scheme is described in detail:
The present invention's application example can realize the dosimeter for slit radiographic apparatus calculation method based on pulse width by PIN semiconductor detector, it is possible to hardware device and software combine:
(1) hardware aspect:
As shown in Figure 4, it is the present invention's application case-based system pulse temporal width information circuit diagram. The final purpose of hardware plan is the pulse providing and having time width information, for next step corrected Calculation provides basis. When different-energy X, gamma-rays incide PIN semiconductor detector, depositing different-energy on PIN semiconductor detector, energetic ray sedimentary energy is many, and low energy sedimentary energy is few. The number of its sedimentary energy means the size of generation current on the semiconductor, is exactly the difference of pulse height after transferring analog pulse signal to, and the information of pulse height information and pulse temporal width is proportional. Present method judges to measure the energy of ray by pulse temporal width information, thus carries out the correction of radiation dose rate.
Its concrete scheme be first by amplifying circuit the radiation information that PIN semiconductor detector measures amplified and electric current signal is converted to analog pulse signal; Then analog pulse signal is converted into numerary signal by comparer, and by choosing specific threshold value in switching process, comparer gives the digital pulse with time width information.
(2) software aspect:
As shown in Figure 5, for the present invention's application example dosimeter for slit radiographic apparatus calculates schema. When the square wave input smart mobile phone after above-mentioned hardware system processes or after micro-chip, the APP software of smart mobile phone or the embedded program of micro-chip are sampled by the sampling thief paired pulses of fixed frequency, by judging that a positive rise and a negative edge judge a complete pulse, provided the time width information of pulse by the number of the sampling point between positive rise and negative edge.
Set n time region in units of microsecond in software, according to the pulse temporal width information obtained, by its time region t in correspondencenInterior counting adds one. After Measuring Time T, each time region tnInterior accumulative count results is Ntn, thus achieve the simple differentiation to ray energy.
By result different-energy X, gamma-rays measured at PIN semiconductor detector in the scale laboratory of specialty, provide different time interval tnInterior counting NtnBe converted to the adjusted coefficient K of radiation dose ratetn. By cumulative different time interval tnNtn��KtnProduct, calculates radiation dose rate result divided by Measuring Time. That is: by described time width information, formula D=(N is utilizedt1��Kt1+Nt1��Kt2+Nt2��Kt3+ ... )/T, by cumulative different NtnAnd KtnProduct, obtain the ionizing radiation dose D in described region, wherein, D represents ionizing radiation dose, NtnRepresent tnCounting rate in time region, KtnRepresent tnMetering correction factor in time region, T represents Measuring Time.
By reference to the accompanying drawings 4, the semiconductor detector of ionizing rays detector adopts PIN-type photosensitive semiconductor detector, after PIN semiconductor detector detects ionizing rays, produce weak current signal, weak current signal forms two-stage amplifier (charge sensitive amplifier and amplifier) by AD8164, is amplified and becomes the manageable pulse signal of subsequent conditioning circuit. The pulse signal produced is converted to digital pulse signal by LM339 comparer (comprising the first comparer and the 2nd comparer), and then through communication module, such as wireless blue tooth or audio port transfer data to smart mobile phone. Audio frequency structured data transmits, and interface adopts the both-end audio frequency interface plug of standard, connects smart mobile phone and detector, and mobile phone carries out data gathering by APP; Blue-teeth data transmission mode bluetooth module adopts nRF51882 ultra-low power consumption wireless chip, BLE4.0 and the 2.4GHZ protocol stack of support achieves transfer, carries out data gathering simultaneously.
Such as use and Android phone ionizing rays measurement APP application software and IOS mobile phone ionizing rays measurement APP application software have been installed, the data results gathered is carried out dosage corrected Calculation and provides calculation result.
Following table 1 gives and uses and the comparing of dose rate calculation result when not using this method and true value, and wherein true value is the reference true value adopting specialty dose calibration unit standard radioactive source generation radiation field to provide, radioactive source employing be Co-60.
| Sequence number | Use present method | It not use present method | True value (radioactive source Co-60) |
| 1 | 346nSv/h | 307nSv/h | 340nSv/h |
| 2 | 1.2��Sv/h | 996nSv/h | 1.17��Sv/h |
| 3 | 31.4��Sv/h | 27.7��Sv/h | 33.2��Sv/h |
| 4 | 137.9��Sv/h | 128��Sv/h | 147��Sv/h |
Table 1
It thus is seen that the present invention's application example can screen X, energy of �� ray by pulse width, and then calculation of radiation dose, it is to increase the accuracy of measuring result. Relative to not considering that the method accuracy of measurement of ray energy improves 10%. Simple relative to the method circuit structure accurately obtaining spectral information, it is easy to realize, cost is low.
It is to be appreciated that the particular order of step in disclosed process or level are the examples of illustrative methods. Based on design preference, it should be appreciated that the particular order of the step in process or level can be rearranged when not departing from protection domain of the present disclosure. Appended claim to a method gives the key element of various step with exemplary order, and is not to be limited to described particular order or level.
In above-mentioned detailed description, various feature is combined in single embodiment together, to simplify the disclosure. Should not be interpreted as reflecting such intention by this kind of open method, that is, the embodiment of claimed theme needs feature more more than the feature clearly stated in each claim. On the contrary, as reflected in appending claims, the present invention is in the state fewer than whole features of disclosed single embodiment. Therefore, appending claims is clearly incorporated in describing in detail hereby, and wherein each claim is alone as the preferred embodiment that the present invention is independent.
For enabling any technician in this area realize or use the present invention, above disclosed embodiment is described. To those skilled in the art; The various alter modes of these embodiments are all apparent, and General Principle defined herein can also be applicable to other embodiment on the basis not departing from spirit of the present disclosure and protection domain. Therefore, the disclosure is not limited to the embodiment provided herein, but consistent with the widest scope of principle disclosed in the present application and novel features.
Description above comprises the citing of one or more embodiment. Certainly, all possible combination describing parts or method in order to describe above-described embodiment is impossible, but it will be appreciated by those of ordinary skill in the art that each embodiment can do further combinations and permutations. Therefore, embodiment described herein is intended to all such changes, modifications and variations containing in the protection domain falling into appended claims. In addition, with regard in specification sheets or claim book use term " comprising ", the mode that contains of this word is similar to term " comprising ", just as " comprising, " in the claims as link word explain such. In addition, it may also be useful to any one term in the specification sheets of claim book " or " it is to be represented " non-exclusionism or ".
Those skilled in the art can also recognize the various illustrative components, blocks (illustrativelogicalblock) that the embodiment of the present invention is listed, unit, and step can pass through electronic hardware, computer software, or both combinations realize. For the replaceability (interchangeability) of clear displaying hardware and software, above-mentioned various illustrative components (illustrativecomponents), unit and step have universally described their function. Such function is realized the design requirements depending on specific application and whole system. Those skilled in the art can for often kind of specifically application, it is possible to use the function described in the realization of various method, but this kind realizes the scope that should not be understood to exceed embodiment of the present invention protection.
The logic block of the various explanations described in the embodiment of the present invention, or unit can pass through general procedure device, digital signal processor, application specific integrated circuit (ASIC), field-programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realize or operate described function. General procedure device can be microprocessor, can selection of land, this general procedure device can also be any traditional treater, controller, microcontroller or state machine. Treater can also be realized by the combination of calculating device, such as digital signal processor and microprocessor, multi-microprocessor, and a Digital Signal Processor Core combined by one or more microprocessor, or other similar configuration any realizes.
Method described in the embodiment of the present invention or the step of algorithm can directly embed hardware, treater performs software module or the combination of both. Software module can be stored in the storage medium of other any form in RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area. Exemplarily, storage medium can be connected with treater, so that treater can read information from storage medium, it is possible to deposit write information to storage medium. Can selection of land, storage medium can also be integrated in treater. Treater and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal. Can selection of land, treater and storage medium can also be arranged in the different parts in user terminal.
In one or more exemplary design, the above-mentioned functions described by the embodiment of the present invention can realize in the arbitrary combination of hardware, software, firmware or this three. If realized in software, these functions can store on the medium with computer-readable, or is transmitted on the medium of computer-readable with one or more instruction or code form. Computer-readable medium comprises computer storage medium and makes to allow computer program transfer to the medium that communicates in other place from a place with being convenient to. Storage medium can be that any general or special computer can the useable medium of access. Such as, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other any may be used for carrying or store with the medium of instruction or data structure and other program code that can be read form by general or special computer or general or special processor. In addition, any connection can be properly termed computer-readable medium, such as, if software is by a concentric cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line (DSL) or being also comprised in the computer-readable medium defined with wireless way for transmittings such as such as infrared, wireless and microwaves from a web-site, server or other long-range resource. Described video disc (disk) and disk (disc) comprise compression disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with magnetic duplication data, and video disc carries out optical reproduction data with laser usually. Above-mentioned combination can also be included in computer-readable medium.
Above-described embodiment; the object of the present invention, technical scheme and useful effect have been further described; it is it should be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment of making, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an ionizing radiation dose acquisition methods, it is characterised in that, described method comprises:
Radiation detector is utilized to measure the radiation information in a certain region;
Undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal;
Described analog pulse signal is converted to digital pulse signal;
According to described digital pulse signal, obtain the time width information of described digital pulse signal;
By described time width information, obtain the ionizing radiation dose in described region.
2. ionizing radiation dose acquisition methods as claimed in claim 1, it is characterised in that, described radiation detector comprises: PIN semiconductor detector; Described radiation information comprises X, gamma-rays radiation information; Described undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information be converted to analog pulse signal, comprising:
By amplifying circuit and undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal.
3. ionizing radiation dose acquisition methods as claimed in claim 1, it is characterised in that, described described analog pulse signal is converted to digital pulse signal, comprising:
By comparer, described analog pulse signal is converted to digital pulse signal.
4. ionizing radiation dose acquisition methods as claimed in claim 1, it is characterised in that, described according to described digital pulse signal, obtain the time width information of described digital pulse signal, comprising:
By the sampling thief of fixed frequency, described digital pulse signal is sampled, by judging that a positive rise and a negative edge judge a whole number pulse signal, obtained the time width information of described digital pulse signal by the number of the sampling point between positive rise and negative edge.
5. ionizing radiation dose acquisition methods as claimed in claim 1, it is characterised in that, described by described time width information, obtain the ionizing radiation dose in described region, comprising:
By described time width information, utilize formula D=(Nt1��Kt1+Nt1��Kt2+Nt2��Kt3+ ... )/T, by cumulative different NtnAnd KtnProduct, obtain the ionizing radiation dose D in described region, wherein, D represents ionizing radiation dose, NtnRepresent tnCounting rate in time region, KtnRepresent tnMetering correction factor in time region, T represents Measuring Time.
6. an ionizing radiation dose acquisition device, it is characterised in that, described device comprises:
Radiation information measuring unit, for utilizing radiation detector to measure the radiation information in a certain region;
Amplify conversion unit, for being undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal; Described analog pulse signal is converted to digital pulse signal;
Time width information acquiring unit, for according to described digital pulse signal, obtaining the time width information of described digital pulse signal;
Ionizing radiation dose processing unit, for by described time width information, obtaining the ionizing radiation dose in described region.
7. ionizing radiation dose acquisition device as claimed in claim 6, it is characterised in that, described radiation detector comprises: PIN semiconductor detector; Described radiation information comprises X, gamma-rays radiation information; Described device also comprises:
Amplify circuit, for being undertaken amplifying by described radiation information and electric current signal corresponding for described radiation information is converted to analog pulse signal.
8. ionizing radiation dose acquisition device as claimed in claim 6, it is characterised in that, described device also comprises:
Comparer, for being converted to digital pulse signal by described analog pulse signal.
9. ionizing radiation dose acquisition device as claimed in claim 6, it is characterized in that, described time width information acquiring unit, specifically for described digital pulse signal being sampled by the sampling thief of fixed frequency, by judging that a positive rise and a negative edge judge a whole number pulse signal, obtained the time width information of described digital pulse signal by the number of the sampling point between positive rise and negative edge.
10. ionizing radiation dose acquisition device as claimed in claim 6, it is characterised in that, described ionizing radiation dose processing unit, specifically for by described time width information, utilizing formula D=(Nt1��Kt1+Nt1��Kt2+Nt2��Kt3+ ... )/T, by cumulative different NtnAnd KtnProduct, obtain the ionizing radiation dose D in described region, wherein, D represents ionizing radiation dose, NtnRepresent tnCounting rate in time region, KtnRepresent tnMetering correction factor in time region, T represents Measuring Time.
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| CN106093428B (en) * | 2016-06-03 | 2018-07-17 | 中国检验检疫科学研究院 | A method of differentiating whether trypetid is handled by quarantine irradiation |
| CN109444939A (en) * | 2018-11-30 | 2019-03-08 | 贵州电网有限责任公司 | A kind of substation's ray detection radiological safety protection method |
| CN109831205A (en) * | 2019-01-16 | 2019-05-31 | 厦门忻德信息技术有限公司 | A kind of pulse counting method based on SoC |
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| CN110289113A (en) * | 2019-06-18 | 2019-09-27 | 中广核核电运营有限公司 | Liquid detecting method, device and computer equipment based on nuclear power container |
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